Support docker desktop on Linux

[cjsewell]

Description

By default it appears build pack only checks /var/run/docker.sock
Docker desktop for Linux creates the socket in $HOME/.docker/desktop/docker.sock

When running pack build on Linux with Docker desktop installed I get the error:
ERROR: failed to build: failed to fetch builder image 'gcr.io/buildpacks/builder:latest': Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Proposed solution

It should check if $HOME/.docker/desktop/docker.sock exists and use that if it does

Describe alternatives you've considered

Creating a symlink works for me as a work around, but this may not work for everyone
sudo ln -s $HOME/.docker/desktop/docker.sock /var/run/docker.sock

[jjbustamante]

Hi @cjsewell, thanks for creating this issue!

Just for curiosity, is your env DOCKER_HOST set?

I think, if you set

export DOCKER_HOST=unix://$HOME/.docker/desktop/docker.sock

it should also work without the symlink

[jjbustamante]

Hi @cjsewell

We just released a RC pack version, it will be great if you can give it a try and confirm the issue was solved

[pellizzetti]

It works for me, @jjbustamante

Thanks a lot! <3